Example of calculating two-dimensional array average value/group average value in php

Source: Internet
Author: User

Calculate the average value of an array. Calculate the average value of a two-dimensional array.

The code is as follows: Copy code

$ Array = array (
Array ('class' => 'A', 'value' => 3 ),
Array ('class' => 'A', 'value' => 4 ),
Array ('class' => 'B', 'value' => 5 ),
Array ('class' => 'B', 'value' => 6)
)

Such arrays can be grouped by class key values to calculate the average value.
You can also calculate the total average value separately. The usage is as follows:

The code is as follows: Copy code

Array_avg ($ array, 'class'); // returns a two-dimensional array.
Array_avg ($ array); // returns a one-dimensional array.
// Returns a one-dimensional array after calculating the average value.
// Parameter $ avgby returns a two-dimensional array based on the average value of the specified field
Private function array_avg ($ array, $ avgby = NULL ){
$ Array_avg = array ();
$ Number = count ($ array );
Foreach ($ array as $ key => $ value ){
If ($ avgby ){
$ Avg_key = $ value [$ avgby];
$ Array_avg [$ avg_key] ['count'] ++;
Foreach ($ value as $ k => $ v ){
$ Array_avg [$ avg_key] [$ k] + = $ v;
            }
} Else {
Foreach ($ value as $ k => $ v ){
$ Array_avg [$ k] + = $ v;
            }
        }
    }
$ Array = array ();
Foreach ($ array_avg as $ key => $ value ){
If ($ avgby ){
Foreach ($ value as $ k => $ v ){
$ Array [$ key] [$ k] = $ v/$ value ['count'];
            }
} Else {
$ Array [$ key] = $ value/$ number;
        }
    }
Return $ array;
}

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